RFrei

Sorry, I am sick at the moment. Maybe we can schedule a call next week?

Hey sadly I still couldn't resolve this issue. Is there anything else I could try?

The Laptops are up to date. This specific Windows patch is not installed, but likely bundled in a newer one? Should I try removing updates?

Hi mMontana, Aren't the vlan capabilities the same on the GS1920v2 and NSW 100/200? GS1920v2 Datasheet: https://www.comms-express.com/assets/specs/GS1920v2-Series-Datasheet.pdf NSW100 Datasheet: https://data.kommago.nl/files/pdf/zyxel_nws100-10p_datasheet.pdf I need the 24 / 28 port versions (I don't have a use for the spf…

Okay, then we will have to lay the cables with a new switch. Thank you both for your suggestions!

Ok... So since WAN1 of Sleepy Dillingen wasn't used anyway, I went ahead and gave it a static IP in the local GUI. Instead of changing the LAN1 subnet of Invite Nürnberg - which would've been a headache since a lot of terminals there are dependent on static IPs. And lo and behold! It works! We have had this problem now for…

@Nebula_Jason Sorry for the delayed answer. Wan2 is 88.x.x.x and wan1 should be 93.x.x.x, although wan1 is used for nothing. The fritzbox router is connected to Wan2 with 88.x.x.x public IP. 

Hi @Nebula_Jason, thank you for your time. I enabled Zyxel support request. The organization name is called "DHC" and the affected sites are called "Metropol Nürnberg", "Invite Nürnberg" and "Sleepy Dillingen". Site Metropol Nürnberg would be mapped to site 1 in my first explanation. So traffic from and to this site is…